Molding-machine



(No Model.)

B, CAMP-BELL. MOLDING MACHINE.

Pa tented- July 18, 1893,

- anom- UNITED STATES PATENT OFFICE.

ROBERT CAMPBELL, or GADSDEN, ALABAMA.

MOLDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 501,824, dated July 18, 1893.

Serial No. 450,129. (No model.)

To all whom it may concern.-

Be it known that I, ROBERT CAMPBELL, a citizen of the United States of America, residing at Gadsden, in the county of Etowah and State of Alabama, have invented certain new and useful Improvements in Molding-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in machines for making molds for casting pipes; and it consists in providing an apparatus whereby the bed-plate can be raised to elevate the mold and free it from the pattern, said bed-plate having a direct vertical movement throughout its entire length while the pattern is securelyheld to the rigid frame of the machine; as will be hereinafter fully set forth and particularly pointed out in the claims.

In the accompanying drawings forming part of this specification: Figure 1 is a side elevation of a molding machine, a part of one side being broken away to better show the construction of the operating mechanism.

2 is an end elevation. Fig. 3 is a sectional view taken through the line 00-03 of Fig. 1. Fig. 4 is a detail view showing a portion of the mechanism for elevating the bed-plate. 51 is a sectional view on the line yy of A designates a suitably constructed rectangular frame, thedepending side pieces of which are provided with bearings for transverse shafts B B. These shafts are loosely mounted in their bearings and have keyed thereon arms I), the arm on one shaft being connected to the arm on the other shaft by a rod 0 so that said shafts will be moved in unison. Upon each shaft on either side of the arm I) are rigidly keyed cams D of suitable construction, preferably with a straight face 61 which terminates at one end in a recess d, said recess being located at the great- .est distance from the center of the shaft. These recesses are adapted to form rests for the rollers carried by the bed-plate and against which the cams bear in raising and lowering saidbed-plate,the shafts B having operating handles B suitably attached thereto.

To the sides of the frame A are rigidly attached upwardly projecting guides e, which are adapted to bear against the side edges of the bed-plate; said bed-plate being provided with outwardly projecting lugs e which pre-' vent the longitudinal movement thereof by bearing against the guide-plates e. Upon suitable cross-bars ff, which are rigidly secured to the frame, is secured the pattern F, which is adapted to shape one-half of the complete mold used for casting a pipe, and this pattern forms practically a part of the stationary frame A.

The bed-plate, E, normally rests upon the upper edges of the frame A, and the side edges of the same are provided with depending guides g, which lie against the side pieces of the frame. This bed-plate is provided on its under side above the shafts B with depending brackets h which support the rollers hereinbefore referred to.

In operation the flask is placed so as to lie upon the bed-plate and the mold formed in the usual manner. When it is desired to separate the mold from the pattern the operator depresses one of the handles which turns the shafts in unison and moves the cams to cause a direct vertical movement of the bedplate so as to separate the mold from the pattern, said mold being carried by the bedplate; thus accomplishing this operation with great accuracy and producing molds which are absolutely similar.

It will be noted that by elevating the mold instead of lowering the pattern any wear or lost movement of the elevating mechanism does not affect thernold, as it does when the pattern is dropped from the mold in the style of machines heretofore used. It also obviates the defect in present machines of having the pattern resting upon a movable or wearing part, .as in such construction the constant and frequent ramming of the clay or sand will affect the movable parts and cause inaccuracy in the product, and any inaccuracy is doubled in the complete mold.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a molding machine, the combination of a frame A, having transverse shafts with projecting arms which are connected to each other, of cams D mounted on the shafts, a pattern supported by the frame A, and a bedplate resting upon the frame and having an opening which registers with the pattern, rollers carried by the bed-plate and positioned so that the cams will contact therewith, and guides e and g carried-respectively by the frame and bed-plate, substantially as shown, and for the purpose set forth.

2. In a molding machine, the combination of a frame A supporting a pattern, a bedplate resting upon the frame and having depending lugs and an opening which registers with the pattern, together with transverse shafts journaled in the frame and having cams mounted thereon which are adapted to contact with the lugs and elevate the bedplate, said cams having a straight face beyond which is a depression, substantially as shown, and for the purpose set forth.

3. The combination with the frame A supporting the pattern and a vertically movable bed-plate apertured for the passage of the pattern and provided with rollers as shown, of transverse shafts provided with cams G which are adapted to be moved in unison,.

said cams having straight faces upon which the rollersbear and recesses within which the rollers will rest when the bed-plate is elevated, substantially as shown.

4. In a molding machine, the combination of a frame A supporting a pattern Which is rigidly secured thereto, a bed-plate resting upon the frame and having depending lugs and an opening which registers with the pattern, guide plates e and 9 attached to an edge of the frame and bed-plate respectively, together with transverse shafts journaled in the main frame and provided with arms projecting in opposite directions and connected to each other by a rod, said shafts having cams mounted thereon which are provided with a straight face upon which the lugs on the bed-plate ride and beyond said straight face with a depression in which the lugs rest, substantially as shown, and for the purpose set forth.

In testimony whereof Iaffix my signature in presence of two witnesses.

- ROBERT CAMPBELL.

Witnesses:

R. E. RANDALL, J os. BALFOUR. 

